不然，如果用foreach不工作

Question

此腳本讀取我使用否則，如果它不工作，從陣列的文字，但如果我用，如果它工作，我想用別的，如果任何人都可以提出一個方法如何做到這一點

if(isset($_REQUEST["maininput"])){ 
foreach($id as $uni){ 
    if (preg_match("/" . $uni . "/i", $_POST['maininput'])){ 
     $founda = $uni; 
     $data = $uni . "\n"; 
     $fname = "accepted.txt"; 
     $file = fopen($fname, 'a');//creates new file 
     fwrite($file, $data); 
     fclose($file); 
     break; 
    } 

} 
}else if{ 
foreach($coures as $mac){ 
    if (preg_match("/" . $mac . "/i", $_POST['maininput'])){ 
     $found = $mac; 
     $data = $mac; 
     $fname = "accepted.txt";//generates random name 
     $file = fopen($fname, 'a');//creates new file 
     fwrite($file, $data); 
     fclose($file); 
     break; 
    } 

} 
}else{ 
foreach($university as $un => $unis){ 
    if (preg_match("/" . $un . "/i", $_POST['maininput'])){ 
     $founde = $unis; 
     //$data = serialize($unis); 
     $fname = "accepted.txt";//generates random name 
     file_put_contents($fname, $unis, FILE_APPEND); 

     //$file = fopen($fname, 'a');//creates new file 
     //fwrite($file, $data); 
     //fclose($file); 
     break; 


    } 
    } 
} 

Answer 1

語法是錯誤的

if(condition) { 
    //magic 
} 
else if(other_condiotion) { 
    //other magic 
} 
else { 
//no magic 
} 

或者你可以使用縮短版本：

$var = (condition) ? true : false; 

http://php.net/manual/en/control-structures.elseif.php

編輯： 這是很難理解你的問題，但似乎你想要做的是：

$found = null; 
$founda = null; 
if(isset($_REQUEST["maininput"])){ 
foreach($id as $uni){ 
    if (preg_match("/" . $uni . "/i", $_POST['maininput'])){ 
     $founda = $uni; 
     $data = $uni . "\n"; 
     $fname = "accepted.txt"; 
     $file = fopen($fname, 'a');//creates new file 
     fwrite($file, $data); 
     fclose($file); 
     break; 
     } 

    } 
} 
else { 
    foreach($coures as $mac) { 
    if (preg_match("/" . $mac . "/i", $_POST['maininput'])){ 
     $found = $mac; 
     $data = $mac; 
     $fname = "accepted.txt";//generates random name 
     $file = fopen($fname, 'a');//creates new file 
     fwrite($file, $data); 
     fclose($file); 
     break; 
    } 
    } 
} 

如果你不提供任何額外的第二個條件檢查使用if(condition_match) {} else {//conditon doesn't match}

使用else if時你有兩個或兩個以上的條件來檢查，如：

$number = 3 
if($number == 1) { //false 
//This is number 1 
} 
else if($number == 2) { //false 
//This is number 2 
} 
else { //true 
//This is number 3 
} 

現在很清楚了嗎？ 查看該鏈接：http://php.net/manual/en/control-structures.elseif.php